This year marks the 100th anniversary of the birth of famed British mathematician Alan Turing, who designed a test in which a human converses with another human and a computer program, and then attempts to determine which is the human and which is the computer.

GPL'ing your core is a good way to protect the core and of monetizing a decent slice of your adoption. But it's better utilized when a project is a bit further along, and it's arguably not a great model for software that will generally have the most valu